I know Han Solo, Chewbacca, and Lando Calrissian reappeared in the Original Trilogy, has anyone else appeared in both Solo:ASWS and other current (Disney) Star Wars Canon?
Below is a list of characters that have appeared in other films and the films they've appeared in.
The character - Films/TV Shows
Information for films characters have appeared in is based on the information from Wookiepedia on character appearances for Solo.
A guide to film acronyms can be found at the bottom.
- Han Solo - ANH, ESB, RotJ, TFA, SW:FoD
- Chewbacca - SW:TCW, RotS, ANH, ESB, RotJ, TFA, TLJ, SW:FoD
- Lando Calrissian - SW:Reb, ESB, RotJ
- Darth Maul - TPM, SW:TCW, SW:Reb
- Qi'Ra - SW:FoD
- Tam Posla - RO
- Weazel - TPM (First identified in Solo, credits to @Neow)
- Aurra Sing† - TPM, SW:TCW
- Bossk† - SW:TCW, ESB, RotJ
Darth Maul and Tam Posla are the only characters who have appeared in other films that wasn't on your original list.
Qi'Ra's first appearance is credited as being for Solo. However the episode of Forces of Destiny she features in was released on the same day as the film (25th May 2018)
†Mentioned only in Solo: A Star Wars Story
TPM - The Phantom Menace
RotS - Revenge of the Sith
ANH - A New Hope
ESB - Empire Strikes Back
RotJ - Return of the Jedi
TFA - The Force Awakens
TLJ - The Last Jedi
RO - Rogue One
SW:TCW - Star Wars: The Clone Wars
SW:Reb - Star Wars: Rebels
SW:FoD - Star Wars: Forces of Destiny
Since L3-37 has been "uploaded" to the Millenium Falcon, I would argue that she is in all the movies in which the Millenium Falcon appears : ANH, ESB, RotJ, TFA, TLJ.